At a glance:

Endpoint Vulnerability

Data in the body of XHR HEAD requests leads to CSRF attacks

Description

Security researcher Johnathan Kuskos reported that Firefox is sending data in the body of XMLHttpRequest (XHR) HEAD requests, which goes agains the XHR specification. This can potentially be used for Cross-Site Request Forgery (CSRF) attacks against sites which do not distinguish between HEAD and POST requests.